Ram Trucks 2015 3500 - CNG Supplement - Manual (Page 10)

MANUAL SHUT OFF VALVE
The manual one-quarter turn shut off valve is located
inside the protective cover for the tanks. It’s location is
identified by a label on the top of the cover. This valve
isolates the fuel containers from the rest of the fuel
system.
Manual Shut Off Valve Access Door
8 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE